Dye-Sensitized Ternary Copper Chalcogenide Nanocrystals: Optoelectronic Properties, Air Stability, and Photosensitivity
| Autor: | Sonam Maiti, Frank Schreiber, Ali Hossain Khan, Iwan Moreels, Dirk Dorfs, Marcus Scheele, Andreas Wolf, Santanu Maiti |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Chalcogenide General Chemical Engineering FOS: Physical sciences Ionic bonding 02 engineering and technology Conductivity 010402 general chemistry Photochemistry 01 natural sciences symbols.namesake chemistry.chemical_compound Materials Chemistry Thin film Absorption (electromagnetic radiation) Photocurrent Condensed Matter - Materials Science Materials Science (cond-mat.mtrl-sci) General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences 3. Good health chemistry symbols 0210 nano-technology Raman spectroscopy Ternary operation |
| Zdroj: | Chemistry of Materials |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/acs.chemmater.8b05108 |
| Popis: | We report on the effect of ligand exchange of copper sulphide selenide as well as copper selenide nanocrystals with the organic pi-system Cobalt beta-tetraaminophthalocyanine and analyse changes in the structural, optical as well as electric properties of thin films of these hybrid materials. A strong ligand interaction with the surface of the nanocrystals is revealed by UV-vis absorption and Raman spectroscopy. Grazing-incidence small-angle X-ray scattering studies show a significant contraction in the interparticle distance upon ligand exchange. For copper-deficient copper selenide, this contraction has a negligible effect on electric transport, while for copper-deficient copper sulphide selenide, the conductivity increases by eight orders of magnitude and results in metal-like temperature-dependent transport. We discuss these differences in the light of varying contributions of electronic vs. ionic transport in the two materials and highlight their effect on the stability of the transport properties under ambient conditions. With photocurrent measurements, we demonstrate high optical responsivities of 200-400 A W-1 for the phthalocyanine-capped copper sulphide selenide and emphasize the beneficial role of the organic pi-system in this respect, which acts as an electronic linker and an optical sensitizer at the same time. Comment: 28 pages, 11 Figures |
| Databáze: | OpenAIRE |
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